Examples range from contamination of the food or water supply, to high levels of air or noise pollution, a chemical accident, a disease outbreak or a natural disaster.

这方面例子的范围包括从食物或水供应的污染，到空气或噪音高度污染、化学事故、疾病暴发或自然灾害。

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To the feature of high pollution for surface treatment industry, and consider water treatment and recycle, this project has following advantages.

针对表面处理行业高污染的特点，充分考虑了水的处理和回收利用，此系统工程具有以下优点。

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A: On top of that, there are a few large chemical factories in the suburbs, which are contributing to the high pollution levels in the water and the air in this city.

最要命的是，郊区还有好几家大型化工厂，这些工厂是这个城市空气和水污染的罪魁祸首。

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These factors include high water temperatures, pollution, sedimentation, high light levels, reduced water levels and changes in salinity.

CNN: Warmer tropical waters portend climate change

In 1972 the Clean Water Act further broadened the law, as Congress became concerned about pollution and water quality, spurred by high-profile incidents such as the Cuyahoga River catching fire in 1969.

WSJ: Federal Offenses: Sewage Blunder Earns Building Engineer a Criminal Record

Contaminated water has been abstracted and treated from the mine since 1992 following an drainage burst which caused visible pollution from mine water coloured orange by the high iron content.

BBC: An archive picture of Wheal Jane